Tips...

There are 3 places that I'd trust with a Porsche, one of them I've already trusted with a Ferrari.
There's Tarek Khleifat's shop (Scuderia shop) in Bayader, next to Cupra car care.
other place is in hanger next to the NMK Dyno Centre in Bayader, you will see Audis and Porsches parked outside. and the 3rd is Ahmad Farah's shop called 911.
It's pretty difficult to give you directions inside bayader, but i'll do my best: now with the detours, going from 8th circle to bayader, passing the traffic lights, keeping Mercedes (Gargour) to your right, take the right turn after Total gas station (follow the cars), then take a right at the intersection (right after the wall), going up hill you'll find yourself inside bayader. keep going straight till you find "911" on your left.

He can bring you all porsche parts aswell, he has the OBD computer that can be connected to your car for the service checkup, as far as I know they're good with rear/mid engined porsches (carrera, boxster, cayman)